Ahh school days, best was me and my mate who were sat at the front of the science lesson, this was the lesson where the teacher got that element that blows up violently in water (the name of it escapes me now), anyways he had huge block of it, and used a knife to slither abit off and but it in a huge bowel, the water exploded out of it........
THEN a knock on the door as another teacher wanted to talk to him outside the room, so there was the class with no teacher in, me and mate on front desk where the block of thingy bob was.........the entire block, the size of a pack of halls was, we looked at it, looked over at the wall where there was one of those old victorian sinks about 2 inches thick of porcilin type, FULL of water...........almost on instinct we grabbed the chemical and threw it in, BOOOOM, blew the sink clean to bits and took out half the wall.
HILARIOUS
We got in lots of trouble mind, but they never knew who it was, as the class all said they didnt see who it was and neither did we